Jamieson, Fausset and Brown on 1 Samuel 13:6

6. When the men of Israel saw that they were in a strait--Though Saul's gallantry was unabated, his subjects displayed no degree of zeal and energy. Instead of venturing an encounter, they fled in all directions. Some, in their panic, left the country (1Sa 13:7), but most took refuge in the hiding-places which the broken ridges of the neighborhood abundantly afford. The rocks are perforated in every direction with "caves," and "holes," and "pits"--crevices and fissures sunk deep in the rocky soil, subterranean granaries or dry wells in the adjoining fields. The name of Michmash ("hidden treasure") seems to be derived from this natural peculiarity [Stanley].